AIR FILTER MEDIUM, AIR FILTER PACK AND AIR FILTER UNIT USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide an air filter medium, air filter pack and air filter unit in which a pressure drop and of the deterioration in collection efficiency are suppressed. SOLUTION: This air filter medium is formed by thermally fusing a nonwoven fabric consisting of core/sheath composite fibers of which the cores are polypropylene and the sheaths are polyethylene on at least one surface of a porous polytetrafluoroethylene membrane.